I am making a footage from our fleet starbase, and I wanted a camera fly through a coridor to doors, see the doors opening and then fly through the doorway into a room behind them. When the doors are closed they look all right. However when a character approaches them and they should open, they suddenly become transparent (looks like about 70 or 80% transparency) and I see these transparent doors opening. Same is with closing the doors. The closing doors are transparent and only when the animation ends, they turns opaque.

Is anybody encountering the same problem in the playback?
Can this be get rid off by some settings in the demo player?